Yahoo Front Page

My Yahoo Front Page is set up as: small column on the left side and large column on the right side. Starting last week while I'm viewing my front page, the column widths shift automatically from 25% & 75% to 33% & 67%. In other words, the smaller left column gets wider, and the larger right column gets smaller. How do I keep the column widths set at approx 25% & 75%?? When I refresh, the columns go to 25% & 75%, but they automatically change to 33% & 67% after 10 - 60 seconds.